JPH0340642B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for rolling a long metal column such as a tube or a bar.

(Prior art) Conventional rolling or perforating machines for long column bodies such as pipes or bars have a structure in which pressure is applied using multiple barrel-shaped rolls or multiple rolls with semicircular grooves. This rolling reaction force was supported by the roll housing on both sides of the roll through bearings and roll jocks. For this reason, a bending moment acts on the roll, and the diameter of the roll must be increased to prevent roll breakage and increase rigidity. However, when the diameter of the rolls is increased, the contact area between the rolls and the material to be rolled increases, and the rolling reaction force increases, so that recent rolling mills have become extremely large. In addition, in conventional rolling mills, the rolls are driven by the end of the roll shaft, so the structure of tilted roll rolling mills, in particular, where the roll shaft is tilted, is extremely complex, and sufficient strength is required. It's getting bigger and bigger. As this improved type, the special public
No. 43980 proposes a rolling mill in which three cantilevered conical rolls are arranged at an angle to revolve around the material to be rolled and rotate on its own axis.

(Problems to be Solved by the Invention) In this improved type, rolling parts, roll adjustment devices, roll drive gears, etc. are built into the rotating part, so it is huge and unsuitable for high-speed rolling. . In all of these cases, the rolling reaction force applied to the rolls is impeded through the roll neck portion, and as long as conventional methods are employed, it has been difficult to make revolutionary technological advances.

An object of the present invention is to provide a tube or bar rolling apparatus that is small in size, has high mill rigidity, and has a high processing speed.

The present invention is a completely new device, and there are no known documents suggesting this invention.

(Means and effects for solving the problems) The present invention is configured as follows. That is, three or more rolling rolls whose rotating shafts are twisted in the same direction and arranged at an angle, a rolling roll connecting ring that connects the rolling rolls in an annular shape and positions them at a predetermined angle, and the rolling roll body. a rotating housing that supports the rotating housing on its cylindrical inner peripheral surface, a fixed housing that supports the rotating housing, a drive device that drives the rotating housing, and a rolling roll connecting ring that stands on a non-rotating part independently of the rotating housing. A rolling device is constituted by a device that collectively positions the rolling rolls by rotatably positioning them in the axial direction, and the same type of rolling devices are arranged adjacent to each other sharing a mill center line on the exit side of the rolling device. A long-column rolling device characterized in that the direction of inclination of the rotation axis of the rolling roll and the direction of rotation of the rotary housing in both rolling devices are opposite to each other.

Three or more rolls are required to stabilize the rolled material on the mill center line, and the rolling roll shaft is affected by the frictional force between the rolling roll and the rolled material when the rolling roll rotates. It must be inclined in the direction in which the rolled material moves forward. The roll connecting ring is for holding the mill roll in a predetermined position within the rotating housing while maintaining a predetermined angle, and rotates together with the mill roll at an angular velocity different from that of the rotating housing. When such a rolling mill attempts to roll a long column, the long column receives a rotational force in the direction of rotation of the rotary housing and attempts to rotate. In the device of the present invention, rolling mills of the same type are arranged adjacently,
By setting the direction of inclination of the roll rotation axes of both rolling mills and the rotation direction of the rotation housing in opposite directions, the rotational forces are mutually canceled out, reducing the rotation of the rolled material and enabling large-scale processing. shall be.

By reducing the rotation of the material to be rolled in this way, linear rolling equipment such as mandrel mills, sizers, and stretch diffusers can be placed close together on the exit side of these rolling mills, sharing the mill center line. It is possible to set it up.

(Example) To explain the present invention in detail, FIG. 1 is a side view of the device of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. 1. Four rolling rolls 3 tilted by twisting the roll rotation shaft 1 in the same direction around the mill center line 2 are connected by a roll connection ring 4 and held at a predetermined position at a predetermined angle. The rolling roll 3 is supported by its inner surface. The dimensions of the path formed by the rolling roll 3 can be changed by changing the inner diameter of the rotating housing and the diameter of the rolling roll, but as shown in FIG. The dimensions of the pass can also be changed by changing the position of the rolls by means of a roll positioning device 6.
The rotary housing 5 is supported by a fixed housing 7 and driven by a drive device 8, and its rotation direction is counterclockwise when viewed from the entry side (left side in FIG. 1).

In the apparatus of the present invention, a rolling apparatus 14A of the same type that shares the mill center line 2 is disposed adjacent to the rolling mill 14 on the exit side thereof. The directions of inclination of the rolls of both rolling apparatuses are opposite to each other, as shown in FIG. 1, and the directions of rotation of the rotary housings are also opposite to each other.

On the outlet side of the device of the present invention, an extractor 9 as shown in the figure is installed, sharing the mill center line 2.
Alternatively, a straight rolling device such as a mandrel mill, sizer, or stretch reducer (not shown) may be provided.

Next, a rolling example using the apparatus of the present invention will be described. A mandrel with an outer diameter of 38 mm is charged into a plasticine tube with an outer diameter of 76 mm, a wall thickness of 18 mm, and a length of 300 mm, and the tube 12 and mandrel 13 are passed through the first rolling device 8 by the mandrel propulsion device 10 and feed roll 11. Guide inside. As shown in the figure, this path is constituted by four rolling rolls 3, becomes narrower toward the exit side, and has a minimum path dimension of 60 mm. The inclination angle of the rolling roll 3 is 4 degrees, and the rotating housing is
It rotates counterclockwise when viewed from the entry side at 1rps.
When the front end of the tube contacts the rolling roll, the rolling force imparts a rotational force and an advancing force to the tube. A force to prevent rotation of the tube is then provided by the mandrel 13 or feed roll 11 or other means, but it is not necessary to stop the rotation of the tube.

The tube comes out of the rolling device 14 with an outer diameter of approximately 62 mm and a wall thickness of 11 mm. The tube then advances into the path of the second rolling mill 14A and undergoes a similar rolling, but this time the rolls 3A are tilted 10 degrees in the opposite direction to the rolls of the first rolling mill and the rotating housing 5
The rotation of A is also 1rps in the opposite direction to that of the first rolling device.
It is. At this time, if the minimum path dimension is 46cm,
The tube has an outer diameter of approximately 48 mm and a wall thickness of 4 mm from the exit side of the rolling equipment.
It comes out like this. When the rear end of the tube leaves the rolling device 14, the tube rotates in the opposite direction to its original direction, and if a force is applied by the mandrel 13 or extractor 9 or other means to prevent the tube from rotating, the tube will be rotated. Even if the rotation does not stop, the tube comes out of the rolling device 14A.

In order to uniformly roll the tube over its entire length, it is desirable to prevent rotation of the tube using an extractor 9 or other straight rolling mill and to perform finish forming.

(Effects of the Invention) According to the rolling apparatus of the present invention, as described above, since the rolling reaction force acting on the rolling roll is linearly received by the rotating housing, the diameter of the roll can be reduced, and the rolling reaction force acting on the rolling roll can be reduced. The contact area between the materials can be reduced, and since there is no need to drive the roll shaft, the roll and housing can be significantly downsized, and the mill rigidity can also be increased. Furthermore, this type of rolling equipment 1
When attempting to roll a long column using only the base, some means is required to prevent the material to be rolled from rotating.
In the apparatus of the present invention, when the front end or the rear end of the tube is rolled with only one rolling device, similar auxiliary means for preventing rotation is required, but when rolling the center part, which consumes most of the rolling time, the adjacent Since the rolling devices cancel each other's rotational forces, the auxiliary means for preventing rotation may be extremely light. Furthermore, by arranging a straight rolling device adjacent to the rolling equipment so as to share a pass line, it is possible to omit reheating for final forming and to significantly shorten the length of the rolling line.

(Field of Application of the Invention) The long column rolling apparatus of the present invention can be used not only for the above-mentioned tube rolling but also for tube rolling without a mandrel, bar rolling, or the first or second rolling apparatus from the exit side. It is also possible to extend the mandrel up to the rolling mill and drill or expand the end of the mandrel. Furthermore, three or more rolling apparatuses of the present invention can be arranged so as to share a mill center line, and in this case, the inclination direction of the rolls of the adjacent rolling apparatuses and the rotational direction of the rotary housing are opposite to each other. .

[Brief explanation of drawings]

FIG. 1 is an example of a side view of the device of the present invention, and FIG.
This is an example of a cross-sectional view taken along line A-A in the figure. 1, 1A... Roll rotation axis, 2... Mill center line, 3, 3A... Rolling roll, 4, 4A... Roll connection ring, 5, 5A... Rotating housing, 6, 6A...
Roll positioning device, 7, 7A... Fixed housing, 8, 8A... Drive device, 9... Extractor, 10... Mandrel propulsion device, 11... Feed roll, 12... Pipe, 13... Mandrel, 14, 1
4A...Rolling device.

Claims (1)

[Claims] 1. The rotating shafts are twisted in the same direction and arranged at an angle. 3.
a rolling housing that supports the rolling roll body on its cylindrical inner peripheral surface; A fixed housing that supports the rotating housing, a drive device that drives the rotating housing, and a non-rotating part that stands independently of the rotating housing and rotatably positions the rolling roll connecting ring in the axial direction to collectively roll the rolling rolls. A rolling device is configured by a device for positioning the rolling device, and rolling devices of the same type are arranged adjacent to each other sharing a mill center line on the exit side of the rolling device,
A long column rolling device characterized in that the direction of inclination of the rotation axis of the rolling roll and the direction of rotation of the rotary housing in both rolling devices are opposite to each other. 2. The long-column rolling device according to claim 1, further comprising a linear rolling device disposed on the exit side of both rolling devices, sharing a mill center line.